Mental abilities of old people and their inventions are inventions with our contemporaries. For example — built in Britain, a huge complex of stones. It consists structures with five-ton and 30-minute blocks. How they were able to build — to this day a mystery, since they did not have modern technical devices. In the documentary film "The Ugly science. Who built Stonehenge "You can assess the achievements of the oldest manufactured thousands of years back and is very applicable to our present life.
The oldest buildings